Factor completely.9y8 - 9z8
A. 9(y2 + z2)(y + z)(y - z)
B. 9(y4 + z4)(y2 + z2)(y + z)(y - z)
C. 9(y4 + z4)(y2 + z2)(y - z)
D. 9(y4 + z4)(y2 + z2)(y2 - z2)(y + z)(y - z)
Answer: B
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Solve the problem.A standardized math test was given to 4000 students. The scores were normally distributed with a mean of 340 and a standard deviation of 60. How many students scored between 220 and 460?
A. 2720 B. 3800 C. 3992 D. 3900
Find the difference.-15 - (-12)
A. -3 B. 3 C. 27 D. -27
Provide an appropriate response.Which of the following sequences do not meet the conditions of the Integral Test? i). an = n(sin n +1) ii). an = 
iii). an = 
A. ii and iii B. 1, ii, and iii C. i only D. i and iii
Factor the trinomial, if possible.-2x3 + 2x2 + 40x
A. -2x(x + 5)(x - 4) B. -2x(x - 5)(x + 4) C. -2x2(x - 5)(x - 4) D. 2x(x + 5)(x + 4)